Are you filtering the iron from the well that's being used to fill the pool? If your pool water contains iron, you may need to add a metal sequestrant, because water containing iron that is exposed to high chlorine levels often turns brownish. However, if you've added the 10 gallon dose already, and the water didn't turn any strange color, then possibly your iron levels aren't high enough to matter, so i that case just keep it at shock level until the green starts clearing up. Keep your pump running, clean it as pressure indicates.

Just out of curiosity, when you said you had multiple algae blooms last year, were you actually seeing algae growing, or was the water just turning green? Did that happen after additions of new water?

Janet

Janet